Sample-taking device



W. G. CHRISTIAN.

SAMPLE TAKING DEVICE.

APPLICATION FILED MAY19. I919.

Patented Ma 24,1921.

In! ii TORNEYI:

b'MTED STATES WAiJTON G. CHRISTIAN, 0F HOUSTON, TEXAS.

SAMPLE-TAKING DEVICE.

israiao.

Application filed May 19, 1919. Serial No. 298,061.

T 0 aZZ whom it may concern.

Be it known that T, WALTON G. CHRISTIAN, a citizen of the United States, residin at Houston, in the county of Harris and tate of Texas, have invented certain new and useful Improvements in a Sample-Taking De vice, of which the following is a specification. This invention relates to new and useful improvements in a sample taking device.

One object of the invention is to provide a device of the character described, adapted to be used in drilling wells, particularly oil wells, and equipped with means whereby samples-of the formation being pierced, as drilling progresses, may be taken. In drill-- ing for oil, or other minerals, it is desirable that samples or specimens of the formation being pierced be obtained by means of which the presence or absence of oil or other minerals is indicated. It is diflicult to obtain accurate samples, inasmuch as water is forced down into the bore to carry away the cuttings from the bit. This device has been provided for obtaining a core or sample of the formation being pierced, which will be protected from the water and maintained in its natural state, until the device is withdrawn to the surface of the ground, for the examination of the sample.

' Another object of the invention is to provide a device of the character described, which is simple in construction and which may be cheaply and easily manufactured and readily removed and replaced.

With the above and other objects in v-iew,

the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and. illustrated in the accompanying drawings, wherein:

Figure 1, is a vertical sectional view of the device, and

Fig. 2, is a transverse sectional view, taken on the line 2-2 of Fig. 1.

Referring now more particularly to th drawings wherein like numerals of reference designate similar parts in each of the figures, the numeral 1, refers to the drill stem which is adapted to be let down into the bore, and the lower end of which carries the bit 2, which is attached to said stem by means of the collar 3. In general contour, the bit 2 is of the usual form of the fishtail bit, now in common usabut 1s o structed Specification of Letters Patent.

somewhat larger than the ordinary fishtail bit, and has the central opening 4:, bored therethrough. The bit also has the water passageways 5, 5, extending from the upper end thereof downwardly, and discharging on opposite sides of the bit through which water is supplied from the drill stem to the cutting points of the bit to carry away the cuttings during the drilling process. The lower end of the core barrel'6 is threaded into the upper end of the bit. This barrel is tubular in form and may be of any length desired, and is somewhat smaller in diameter than the drill stem. This barrel is arranged concentrically within thestem, and its upper end carries a couplin 7, formed with a valve seat 8 therein, havlng the central fluid passageway 9, which is controlled by the ball valve 10 whichis dropped into the drill stein from the top of the ground just before taking the core. Threaded in the upper end of the coupling 7, there is 'an upwardly flared nipple 11, which retains the ball valve 10 in place, and which is provided with fluid ports 12.

In drilling, the cutting blades of the bit disintegrate the formation, and the cuttings are carried away by the water which is forced under pressure down through the drill stem and passageways 5, 5, said waterreturning laden with said cuttings up through the bore around the stem to the surface of the ground. The water which enters the nipple 11 passes on through the ports 12, and then down through the stem as explained. As drilling progresses, it is Patented May 24, 1921.

apparent that a core will be formed which.

will pass up through the opening 4:, into the barrel 6, and as said core is advanced up into the barrel, the ball valve 10 will lift to permit the air and water in the barrelto escape. When the stem is withdrawn to obtain the sample, the valve 10 will seat and close the seat 8, and the sample will be retained in the barrel by air pressure from beneath, and when said valve is seated, the fluid in the stem above the nipple 11 will be permitted to pass through the ports 12, and on down and out through the passageways 5.

What I claim is:

1. A device of the character described, including a hollow drill stem, a drill bit attached to the lower end thereof and provided with a central opening, a barrel whose lower end is attached to the upper end of said bit, in a'linement with said opening, said barrel extending up into the stem, a valve 2. A device of the character described, in-

eluding a hollow drill stem, a drill bit attached to the lower end thereof,- having a central opening, a core barrel threaded into the upper end of said bit in alinement with said opening and extending up in through the stem, a valve seat carried by the upper end of the barreland provided with an opening, an upwardly flared nipple screwed 15 In testimony whereof I have signed my 20 name to this specification in the presence of two subscribin witnesses.

W TON G. CHRISTIAN.

Witnesses:

WM. A. CATHEY, E. V. HARDWAY. 

